"As an immediate step, I've asked Parks Victoria to put in place a process to reduce the number of credit cards currently in use and for that to be provided to me by Friday," Ms D'Ambrosio said in a statement on Monday.

The 1200-staff organisation has 549 credit cards, which led to a bill of $2.2 million in 2015/16, up $300,000 from four years earlier.

Opposition environment spokesman Brad Battin, who obtained the records under Freedom of Information laws, said the money could have been put to better use.